| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a circuit board for a compound type roof mount antenna having a good pass characteristic of a signal in a high frequency band. <P>SOLUTION: The circuit board for a compound type roof mount antenna includes a signal input land 10, an AM/FM band pass filter 20, a high-frequency band pass filter 30, a high-frequency band wiring 40, and an AM/FM band wiring 50. The AM/FM band pass filter 20 sends a signal of an AM/FM band among a composite signal. The high-frequency band pass filter 30 sends a signal of such a frequency band as higher than the AM/FM band among the composite signal. The high-frequency band wiring 40 extends from the signal input land 10 to the high-frequency band pass filter 30. Relating to the AM/FM band wiring 50, the wiring up to the AM/FM band pass filter 20 is equal to or shorter than the high-frequency band wiring 40 when viewed from the high-frequency band pass filter 30. <P>COPYRIGHT: (C)2012,JPO&INPIT |
